The temperature dependences of the effective mass and the self-energy of the interface polaron are investigated by means of the Lee-Low-Pines variation method. The influence of the electron interaction with both the bulk longitudinal optical (LO) and the surface optical (SO) phonons on the temperature characteristic of the interface polaron is discussed. Numerical calculation, for GaAs-GaSb as an example, illustrates that both the effective mass and the self-energy will decrease with increasing temperature. Near the interface of crystals, the electron-so phonon interaction will play the main role in determining the temperature behaviour of the interface polaron.